nStor NexStor 4200F Series, Руководство пользователя

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Chapter 2 - Topologies and Operating Modes
Multi-TID Single Host-Dual Connection
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Multi-TID Single Host-Dual Connection
Duplex Mode Logical View - Multi-TID Single Host-Dual Connection
This Multi-TID topology provides an active-active RAID storage solution for
single host systems with dual Fibre ports.
It offers advantages of redundant active-active controllers, and transparent
failover and failback operations, LUN isolation (LUNs appear only once to the
host OS, and dual connections for higher performance independent access to
assigned LUNs.
It has two disadvantages which are a single point of failure in the host HBA and
the single Fibre loop.
In this configuration the Host I/O card switch 4 is set to the “Up” position.
Switch 4 ties the H0 and H1 ports to the same Fibre loop. This allows both host
port on each Host I/O card with an active connection to the specific controller
host port.
FC HBA 1
Host/Server (Node A)
FC HBA 2
H0
H1
Right Host I/O Card
Left Host I/O Card
SW 4
H0 H1
SW 4
SW 5 SW 5
Controller 0 Controller 1
FC Host
C1P0
Active
FC Host
C1P1
Active
FC Host
C0P0
Active
FC Host
C0P1
Active
4200F.book Page 28 Thursday, January 23, 2003 2:47 PM